The electro-therapeutic guide, or, A thousand questions asked and answered . AI^TERNATED CURREiNT RECTIFIERThe accompanying cut shows the common form of rectifier, with four THE BIvECTRO-THERAPEUTlC GUIDE 55 aluminum cells arranged in a quadrangle, although they may be arrangedin a row, if more convenient, to place on top of a wall plate case. There are several kinds of rectifiers, as the magnetic, inductive, mechan-ical, and electrolytic, but the last named kind is the best, because it is themost reliable, simplest and cheapest, and most economical, and having nomoving parts, will not get out
The electro-therapeutic guide, or, A thousand questions asked and answered . AI^TERNATED CURREiNT RECTIFIERThe accompanying cut shows the common form of rectifier, with four THE BIvECTRO-THERAPEUTlC GUIDE 55 aluminum cells arranged in a quadrangle, although they may be arrangedin a row, if more convenient, to place on top of a wall plate case. There are several kinds of rectifiers, as the magnetic, inductive, mechan-ical, and electrolytic, but the last named kind is the best, because it is themost reliable, simplest and cheapest, and most economical, and having nomoving parts, will not get out of order. They are called aluminum cells, because one element of the cell is madeof aluminum. The practical value of the rectifier depends on the peculiar propertypossessed by aluminum, in that it will offer a very high resistance to thepassage of the current, when it is so placed as to be the anode of the cell,but does not so act when placed so as to be the cathode in the ^ PATIENT CIRCUIT.© PLAN opWIRINC OF ALUMINUM FOUR CELL RECT/FIER, This disposition of the cells was arranged by Graetz, and is an ap-plication of what is known as the Wheatstone bridge. If we pass an alternated current through an aluminum cell, as mention-ed above, we will have an almost complete and instantaneous arrest of animpulse in one direction, but there will be no change in the impulse in the 56 THE ELECTRO-THERAPEUTIC GUIDE alternate direction, and we would have an interrupted current, and it is onthis basis that the four cells of the rectifier shown in the accompanying cutare grouped so as to lead all the impulses of both alternations in the samedirection, and deliver a continuous current. NATIONAL COLLEGE SINUSOIDAL TRANSFORMERWhat is a transfofmer, and its uses?
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